title: Acute effects of sildenafil in patients with primary pulmonary hypertension receiving epoprostenol.
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D002302:Cardiac Output / Q000187:drug effects; D004359:Drug Therapy, Combination; D011464:Epoprostenol / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D006976:Hypertension, Pulmonary / Q000188:drug therapy* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000008:administration & dosage; D010879:Piperazines / Q000008:administration & dosage*; D011651:Pulmonary Artery / Q000187:drug effects / Q000503:physiopathology; D011652:Pulmonary Circulation / Q000187:drug effects; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D009569:Nitric Oxide; D000068677:Sildenafil Citrate; D011464:Epoprostenol